This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A lengthy, appended exposition of a topic or point.

n. A digression.

n. A fuller treatment (in a separate section) of a particular part of the text of a book, especially a classic.

n. A narrative digression, especially to discuss a particular issue.

n. A dissertation or digression appended to a work, and containing a more extended exposition of some important point or topic.

n. A digression; an excursion.

n. A dissertation inserted in a work, as an edition of a classic, to elucidate some obscure or important point of the text.

n. a message that departs from the main subject

"Justice Antonin Scalia dismissed it as unnecessary and even unhelpful "excursus," but the Supreme Court on Thursday gave the American people - increasingly devoted to their electronic communication devices - some broad hints that the Justices are sensitive to claims for protection for the ..."

content    message    substance    subject-matter   

excursion   

discussion    digression   

-ways    re-examination    catechising    definer    dialing